LASER CUTTING HEAD FOR CUTTING HARD, BRITTLE PRODUCT AND LASER CUTTING DEVICE

A laser cutting head for cutting a hard, brittle product (10). The laser cutting head comprises a polarizing element (1), a binary phase element (2), and a focusing element (3) arranged in sequence. A laser beam passes through the polarizing element (1) to form a polarized laser beam. The polarized laser beam is then directed to the binary phase element (2), and forms a diffracted laser beam at the binary phase element (2). The diffracted laser beam is then directed to the focusing element (3), and forms a focused laser beam at the focusing element (3) for cutting the hard, brittle product (10). Also disclosed is a laser cutting device. The laser beam sequentially passes through the polarizing element, the binary phase element, and the focusing element to be finally converted into a focused laser beam having a long focal depth and exhibiting a uniform variation in peak power density, thus enabling penetration into the hard, brittle product, and achieving cutting of said product in an ideal ...